User Meta Pro require validate your licence to activate Pro version.
To validate your licence, go to User Meta >> Settings.
Some host may block port 80. If it happen to you, your server may not be able to contact with user meta server to validate the licence. In that case you may ask your host to open the socket or you can use this remote activation form to validate your licence.
Please note, to validate remotely, we require any of your username and password which have admin role in your site. We won’t store any of your authentication data. For your satisfaction, you may create a temporary admin account for licence validation purpose and delete that account after completing validation. Or you can simply change your password after validating licence.